135 cards in Transformation Mask:
Abra Accompanying Flute Aggron Aipom Alakazam Ambipom Applin Aron Blissey ex - 085/101 Blissey ex - 121/101 Brute Bonnet Buddy-Buddy Poffin Bug Catching Set Carmine - 097/101 Carmine - 123/101 Carmine - 130/101 Chandelure Chansey - 084/101 Chansey - 113/101 Chimecho - 050/101 Chimecho - 106/101 Clefable Clefairy Conkeldurr Cornerstone Mask Ogerpon ex - 065/101 Cornerstone Mask Ogerpon ex - 119/101 Cornerstone Mask Ogerpon ex - 128/101 Darmanitan Darumaka Dipplin - 012/101 Dipplin - 103/101 Dragapult ex - 081/101 Dragapult ex - 120/101 Drakloak Dreepy Ducklett Emolga Enhanced Hammer Farfetch'd Feebas Festival Grounds Fezandipiti - 056/101 Fezandipiti - 108/101 Finizen Froslass - 033/101 Froslass - 104/101 Glalie Glimmet Glimmora Goldeen Grookey Gurdurr Handheld Fan Hassel - 098/101 Hassel - 124/101 Hearthflame Mask Ogerpon ex - 022/101 Hearthflame Mask Ogerpon ex - 115/101 Hearthflame Mask Ogerpon ex - 126/101 Heatran Heracross Illumise Iron Bundle Jamming Tower Jynx Kadabra Kieran - 096/101 Kieran - 122/101 Kieran - 129/101 Kilowattrel Lairon - 074/101 Lairon - 111/101 Lampent Legacy Energy Litwick Luxio Luxray ex - 041/101 Luxray ex - 118/101 Mightyena Milotic Munkidori - 055/101 Munkidori - 107/101 Ogre's Mask Okidogi - 064/101 Okidogi - 110/101 Palafin Palafin ex - 036/101 Palafin ex - 116/101 Palossand Phantump Poliwag Poliwhirl Poliwrath Poltchageist Poochyena Revavroom Rillaboom Sandshrew Sandslash Sandygast Scolipede Scoop Up Cyclone Seaking Secret Box Shinx Sinistcha Skarmory Slurpuff Snorunt Sunflora - 002/101 Sunflora - 102/101 Sunkern Swanna Swirlix Tatsugiri - 082/101 Tatsugiri - 112/101 Teal Mask Ogerpon Teal Mask Ogerpon ex - 016/101 Teal Mask Ogerpon ex - 114/101 Teal Mask Ogerpon ex - 125/101 Teal Mask Ogerpon ex - 131/101 Thwackey Timburr - 059/101 Timburr - 109/101 Transformation Mask Booster Box Transformation Mask Booster Pack Trevenant Varoom Venipede Volbeat Wattrel - 043/101 Wattrel - 105/101 Wellspring Mask Ogerpon ex - 038/101 Wellspring Mask Ogerpon ex - 117/101 Wellspring Mask Ogerpon ex - 127/101 Whirlipede